Will Lysine help with recurring and painful mouth ulcers?

I am rarely free from painful mouth ulcers. As one crop heals another crop is building up. This means that frequently I am unable to eat anything but liquids. I have tried many cures and doctors/dentists treatments to no avail. I frequently pass out caused by lack of food and have twice been admitted to hospital with injury sustained by fainting.I have now started to try Lysine caplets with fingers crossed.